a) If |
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b) If |
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c) If |
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d) If |
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e) If
is an equilateral triangle of side
.
Also if and
are the radii of the circumscribed and inscribed circles of
, then
f) Important notes:
- If two circles touch internally, then the distance between their centers is equal to the difference of their radii.
- If two circles touch externally. Then the distance between their centers is equal to the sum of their radii.
- The distance moved by a rotating wheel in one revolution is equal to the circumference of the wheel.
- The number of revolutions completed by a rotating wheel in one minute